1. The principle "problem" is that it does not incorporate abiogenesis--the origin of life itself. Darwin's theory does a superb job of accounting for speciation, the great diversity of life we find on this planet.
It is apparent all life originated from one to three common ancestors. Whether eukaryotes, prokaryotes and archaea share common ancestry or not is unknown. It is possible life arose three or more times.
Yet no process for the origin of life is well detailed. We have at best murky possibilities, such as an RNA world preceding our "DNA" world, and so on.2. Darwin's theory, when originally proposed, did not account for mechanisms of variation.
This problem has since been resolved with the discovery of inheritable mutations in the structure of the "recipe" molecule deoxyribonucleic acid (DNA), and the incorporation of molecular biology in what has become known as "the modern synthesis."3. Although any scientific theory will suffer trivial defects, and evolution is no exception, I am at a loss as to what might constitute a third "main" problem of the theory. It has no competitors, a hallmark of a fairly strong and robust theory.
That in itself could be considered a problem. Theories with decent competition provide fertile ground for the progress of science, in the testing between alternatives. There are no strong contenders for the origin of species within the field of biology, leaving evolutionary biologists little to do besides dot the i's and cross the t's.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.